JP5161538B2 - Windproof snow sheet - Google Patents

Description

  The present invention relates to a sheet suitable for a windproof sheet for decelerating wind speed, a snowproof sheet for reducing the amount of snow blown, and the like.

  Conventionally, in snowstorm areas such as Hokkaido and Tohoku, windbreak snow fences have been installed on the side of the road to avoid snow accumulation on the road and visibility problems. This windproof snow fence has a structure in which a panel is fitted between support columns installed at regular intervals. Although such a windbreak snow fence has the effect of windbreak snow, the panel is often removed during periods other than the snowfall period due to difficulty in securing visibility and problems with the landscape. However, it was necessary to install and remove panels every year before and after the snowfall period, and there was a need to reduce the work burden. As one of the solutions, a method has been proposed in which a mesh-like sheet is used in place of the conventionally used panel, so that installation and removal of the panel is unnecessary, and visibility is ensured while obtaining a wind and snow effect. ing. For example, Patent Document 1 discloses a mesh sheet obtained by applying resin processing to a mesh fabric. When such a mesh sheet is used, the other side of the sheet can be seen through, and the visibility is good. Even during periods other than snowfall, it can be installed as it is and there is no need for removal work. However, when such a sheet is used during a snowfall period, the mesh portion is clogged with snow, and visibility cannot be secured, and the advantage of using the mesh sheet cannot be exhibited, and the weight of the clogged snow damages the sheet. There was a thing. With respect to these problems, in Patent Document 2, when a nichrome wire and / or a filamentous heating element is disposed in a fiber group constituting a mesh-like sheet and snow melting is performed by the heating action, a desired sheet is obtained. To solve this problem. However, when these mesh-like sheets are used as a windbreak snow fence on the side of the road, the windbreak snow fence itself is difficult to see at night due to the good visibility, which is a feature of the mesh sheet, and it is difficult for the driver to find it Is left.

JP-A-8-170244 JP 2001-140224 A

  An object of the present invention is a sheet suitable for a windproof sheet for reducing the wind speed, a snowproof sheet for reducing the amount of snow blown, and the like, which solves the problems of the prior art, and has a retroreflective performance. It is to provide a safe windproof snow sheet that is easy to find a windproof snow fence even at night.

  As a result of intensive studies by the present inventors, it has been found that the above-mentioned problems can be achieved when the sheet is constructed next.

Thus, according to the present invention, the fiber group A and the fiber group B are arranged in a lattice pattern, and the arrangement of the fiber group A of the mesh-like voids surrounded by the fiber group A and the fiber group B A sheet comprising a woven or knitted structure having a direction and a width in the arrangement direction of the fiber group B of 2 to 15 cm, and a resin containing glass beads attached to the woven or knitted structure, the glass beads The content of is 30 to 100 parts by weight with respect to 100 parts by weight of the resin, the particle size of the glass beads is 30 to 120 μm, and the resin adhesion amount is 100 to 300 g / m ^2. A windproof snow sheet is provided.

  ADVANTAGE OF THE INVENTION According to this invention, lights, such as a car, are retroreflected also at night, it is easy for a driver to find the wind-proof snow fence installed in the side of a road, and can drive | work safe.

  The windproof snow sheet of the present invention is a woven or knitted structure in which a fiber group A and a fiber group B are arranged in a lattice pattern, and a mesh-like void surrounded by the fiber group A and the fiber group B is formed. Become. The widths of the mesh-shaped voids in the arrangement direction of the fiber group A and the arrangement direction of the fiber group B must be 2 to 15 cm, respectively. If this width is smaller than 2 cm, the amount of passing wind and snow will be too low, the sheet will be heavy, the working area will be limited, transparency will be impaired, and visibility will be poor when installed. Become. On the other hand, when the width exceeds 15 cm, it is difficult to reduce the flow velocity of the wind. The width may be arbitrarily set in the arrangement direction of the fiber group A and the arrangement direction of the fiber group B within a range of 2 to 15 cm depending on the application and a desired flow rate.

  In the fiber group A, it is preferable that adjacent fibers are arranged at intervals of 0.5 mm or more, and a slit-shaped gap is formed. The slit-shaped gap exhibits an appropriate wind speed reduction effect under normal wind speed (10 m / second or less), and functions to prevent fluid (for example, wind) passing through the sheet from becoming turbulent. On the other hand, under strong wind (20 m / second or more), the wind is released as much as possible, and excessive tension is applied to the seat mounting portion and the like to prevent breakage. Also, the transparency of the sheet can be improved. The interval between adjacent fibers, that is, the width of the slit-shaped gap may be set as appropriate according to the application and desired flow rate, but if it becomes too large, the effect will not be fully manifested, so about 5 mm at most. It is preferable to stop. The type and fineness of the fibers constituting the fiber group A are not particularly limited, and synthetic fibers, semi-synthetic fibers, regenerated fibers or filament yarns of natural fibers, spun yarns, etc. can be arbitrarily adopted, but the strength and light resistance are From the point of view, a polyester multifilament yarn, in particular, a so-called twisted cord-like polyester multifilament yarn in which a plurality of polyester multifilament yarns having a lower twist are aligned and then subjected to an upper twist is preferable.

  Further, in the fiber group B, as in the fiber group A, adjacent fibers may be arranged at intervals of 0.5 mm or more to form slit-like gaps, and adjacent fibers are in the fiber group A. The fiber group may be integrated more densely. The type and fineness of the fibers constituting the fiber group B are not particularly limited, and as in the fiber group A, a synthetic fiber, a semi-synthetic fiber, a recycled fiber, a filament yarn of a natural fiber, a spun yarn, etc. can be arbitrarily employed. Since the yarns are densely arranged and tend to be hard, it is preferably a non-twisted yarn of a polyester multifilament yarn.

  The widths of the fiber groups A and B may be set as appropriate according to the desired flow rate and strength, but are preferably 2 to 15 cm, similar to the width of the mesh-shaped gap. When this width is less than 2 cm, the strength may be weakened or the durability may be deteriorated. On the other hand, when the width exceeds 15 cm, the amount of fluid passing through decreases and turbulence easily occurs, so that the transparency is lowered and the visibility when installed is deteriorated.

  In the present invention, a resin containing glass beads is attached to the woven / knitted structure, and the content of the glass beads is 30 to 100 parts by weight with respect to 100 parts by weight of the resin. It is important that the particle size is 30 to 120 μm. Thereby, the outstanding retroreflection performance can be provided to a sheet | seat.

  Here, retroreflection refers to a phenomenon in which light applied to a reflecting object hits the reflecting object and reflects in the irradiated direction. In order for the sheet to exhibit sufficient retroreflection performance, the difference in gain value between 5 ° and 50 ° of the sheet is preferably 0.1 to 5.0, preferably 0.5 to 3.0. More preferably. If the gain difference is less than 0.1, retroreflection may not be confirmed with the naked eye. If it exceeds 5.0, the gain difference may be too large, and the reflected light may not be confirmed with a slight deviation from the light source. is there. The present invention has found that such a difference in gain values can be achieved by using a sheet having the above-described configuration.

  The content of the glass beads needs to be 30 to 100 parts by weight, preferably 50 to 80 parts by weight with respect to 100 parts by weight of the resin. If the glass bead content is less than 30 parts by weight, the glass beads that are buried inside the resin increase, and the retroreflective performance may not be sufficiently exhibited. Conversely, if the glass bead content is more than 100 parts by weight, the resin may not hold the glass beads and the glass beads may fall off the sheet.

  The particle size of the glass beads is 30 to 120 μm, preferably 50 to 100 μm. If the particle size of the glass beads is less than 30 μm, the above content increases the number of glass beads buried in the resin, and the retroreflective performance may not be sufficiently exhibited. Conversely, if the glass bead grain system is larger than 120 μm, the flexibility of the resin is impaired, and there may be a problem in appearance quality such as cracks.

  The resin that holds the glass beads and adheres them to the woven or knitted structure also has the effect of improving light resistance, wear resistance, and the like. Examples of the resin include polyvinyl chloride, polyvinyl chloride, polyurethane, polyethylene, chlorinated polyethylene, and polyester. Polyvinyl chloride is preferable in terms of weather resistance and cost.

Preferably adhesion amount of the resin is 100 to 300 g / ^{m 2,} and more preferably 150 to 250 g / ^{m 2.} If the adhesion amount of the resin is less than 100 g / m ² , the glass beads cannot be sufficiently held on the sheet, and the weather resistance of the windproof snow net may be deteriorated. On the contrary, when the adhesion amount of the resin is larger than 300 g / m ² , the sheet weight is increased and the voids existing between the fibers are reduced. Moreover, the ratio of the glass beads buried in the resin increases, and the retroreflection performance tends to be lowered.

  In the present invention, the total porosity of the sheet is preferably 20 to 80%, and more preferably 40 to 70%. When the porosity is less than 20%, the sheet itself becomes heavy. For example, when it is used as a windproof sheet, an excessive tension may be applied to the attachment site by wind. On the other hand, when the porosity exceeds 80%, it may be difficult to control the wind speed. That is, when used as a windproof sheet, it is preferable to control the wind speed reduction rate at a wind speed of 20 m / sec in the range of 30 to 70%, but when the porosity exceeds 80%, the amount of air permeation is too large, It becomes difficult to control within the range of the wind speed reduction rate.

  In addition, the strength of the sheet in the arrangement direction of the fiber group A and the arrangement direction of the fiber group B is preferably 100 kg / 10 cm to 1000 kg / 10 cm, respectively. When the strength is less than 100 kg / 10 cm, the sheet is likely to break and the durability may be deteriorated. On the other hand, when the strength exceeds 1000 kg / 10 cm, the sheet becomes heavy and hard, and workability may be reduced.

  The sheet of the present invention can be produced by forming a woven or knitted fabric having a mesh-like void having the above-described configuration by a known method, and applying a resin containing glass beads thereto. At this time, the method of applying the resin may be dipping or coating. However, since the sheet has a very large number of voids, dipping that can apply the resin evenly to the fiber side surface is preferable.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, the physical property of the sheet | seat in an Example was measured with the following method.

(1) Total porosity The sheet is placed on the stage glass of a light box incorporating a 10 W fluorescent lamp, and a photograph of the transmitted light is taken. In photographing and printing, the photographing magnification and the printing magnification were adjusted so that one repeating unit of the sheet was reproduced on the photographic paper at the same magnification. In the above photograph, the voids mainly composed of mesh-shaped voids and slit-shaped voids are reproduced as white and bright regions, so the total area of all voids in one repeating unit (this is S1). , And the area occupied by one repeating unit (referred to as S0), and the total porosity was calculated by the following formula. In addition, the measurement was implemented 5 times about 1 type of sheet | seat, and made the average value the value of the total porosity. Moreover, the apparent diameter of the fiber which comprises the fiber group A, and the width | variety of a slit-shaped space | gap were also measured from said photograph.
Total porosity (%) = S1 / S0 × 100

(2) Visibility of sheet transparency of sheet The sensory evaluation was performed on the visibility of the windproof sheet laid by the above method.

(3) Difference in gain value The above sheet is pasted on the wall of the dark room, the white screen of the projector (MP-700 manufactured by Nippon Avionics) is irradiated from a position 2 m from the wall, and the luminance of the sheet surface is measured with a luminance meter (LS manufactured by Konica Minolta LS). -100). The obtained luminance was substituted into the following equation and converted into a gain value. The gain value was measured at a position where the projector position was 0 °, and was shifted to the right by 5 ° and 50 °. The difference between the gain values of 5 ° and 50 ° was obtained.
Gain value = luminance / illuminance × 3.14

(4) Average particle diameter of glass beads The dried particles were photographed with a transmission electron microscope S-3500N manufactured by Hitachi, Ltd., selected for 100 arbitrary points, and the equivalent sphere diameter was determined to obtain the average particle diameter.

[Examples 1 to 3, Comparative Examples 1 and 2]
Using a weft insertion raschel knitting machine (9G), a high-strength polyester multifilament yarn (manufactured by Teijin Fibers Ltd., BHT1000-192), which is a warp insertion yarn (fiber group A), is arranged on the heel L3. Threads with a 40t / m twist on the strips, supplied in 12in and 12out to a density of 9 / in, and high-strength polyester multifilament yarns (Teijin) BHT50-24) made of fiber is supplied at 12in and 12out with 2 bars so that the structure of L1 is 10/01 and L2 is 01/10, and further, weft insertion yarn (fiber group B) is high strength Polyester multifilament yarn (made by Teijin Fibers Ltd., BHT1000-192) is fed to a yarn that is twisted at 40 t / m and fed to a yarn of 5 / in. In 6in, organized in 6out, to obtain a knitted fabric having a mesh-like air gap. The width of the fiber group A was 30 mm and the width of the slit-shaped gap was 3.8 mm, and the width of the fiber group B was 30 mm and the width of the slit-shaped gap was 1.6 mm. Further, the width of the mesh-shaped gap of the knitted fabric was 30 mm in the arrangement direction of the A fiber group and 31 mm in the arrangement direction of the B fiber group.

Subsequently, glass beads (UB-01M (average particle size 32 μm), UB-24M (average particle size 54 μm), UB-47M (average particle size 84 μm), SPM-25 (average particle size 25 μm), UB-79L manufactured by Unitika) (Average particle diameter of 132 μm) is dispersed in 50% by weight of water-dispersed polyvinyl chloride resin (Vinyl Blanc 680S manufactured by Nissin Chemical Co., Ltd.) so that the glass beads are 80% by weight with respect to 100 parts by weight of the resin. This was added, and this was attached to and impregnated into the knitted fabric by dipping to obtain a sheet. The adhesion amount of the resin was 170 g / m ² .

[Examples 4 to 6, Comparative Examples 3 and 4]
Using a background insertion Russell knitting machine (24G), a high-strength polyester multifilament yarn (manufactured by Teijin Fibers, BHT1000-192), which is a warp insertion yarn (fiber group A), is applied to the heel L3, a 00/11 structure, It is supplied at 32 in and 38 out so as to have a density of 24 pieces / in, and the high-strength polyester multifilament yarns (made by Teijin Fibers, BHT50-24), which are entangled yarns, are used for the collars L1 and L2. , L2 is supplied at a rate of 01/10 with 32 bars and 32outs, and as weft insertion yarns (fiber group B), high-strength polyester multifilament yarns (manufactured by Teijin Fibers, BHT1000-192) ) Is supplied to a yarn with 40 t / m twisted on a yarn that is aligned with 4 yarns, and a density of 6.75 yarns / in is 9 in, 9 out Form, to obtain a knitted fabric having a mesh-like air gap. The width of the fiber group A was 34 mm, the width of the slit-shaped gap was 3.0 mm, the width of the fiber group B was 30 mm, and the width of the slit-shaped gap was 0.5 mm. The width of the mesh-shaped voids of the knitted fabric was 36 mm in the arrangement direction of the A fiber group and 40 mm in the arrangement direction of the B fiber group.

Subsequently, glass beads (UB-47M manufactured by Unitika (average particle size 84 μm)) and water-dispersed polyvinyl chloride resin (Nishin Chemical Co., Ltd., BINIBLAN 680S) were dispersed in 50% by weight of water with respect to 100 parts by weight of the resin. Glass beads were added so as to have an addition amount (% by weight) shown in Table 1, and this was adhered to and impregnated into the knitted fabric by dipping to obtain a sheet. The adhesion amount of the resin was 170 g / m ² .

[Comparative Example 5]
Using a knitted fabric having mesh-like voids similar to that in Example 1, without adhering glass beads, only 50% by weight of a water-dispersed polyvinyl chloride resin (Nishin Chemical Co., Ltd., Vinyl Blanc 680S) was adhered and impregnated by dipping, Obtained. The adhesion amount of the resin was 170 g / m ² .

[Comparative Example 6]
A tent cloth (New Pasty made by Teijin Fibers) coated with a vinyl chloride resin on a polyester base material was used as a comparative sheet.

  Table 1 shows the results of implicit determination of the void ratio, the visibility, the difference between the gain values at 5 ° and 50 °, and the appearance quality of the sheets obtained in the above Examples and Comparative Examples.

  The sheet | seat of this invention can be used suitably for the wind-proof sheet for decelerating a wind speed, the snow-proof sheet for reducing the blowing amount of snow, etc. Especially when used as a windbreak snow fence to be installed on the side of the road, it is possible for the driver of the vehicle to notice the presence of the windbreak snow fence at night and to promote safe driving. It is.

Claims (2)

The arrangement direction of the fiber group A and the arrangement of the fiber group B of the mesh-like voids, in which the fiber group A and the fiber group B are arranged in a lattice shape and are surrounded by the fiber group A and the fiber group B A sheet made of a woven or knitted structure having a width in the direction of 2 to 15 cm, and a resin containing glass beads is adhered to the woven or knitted structure, and the content of the glass beads is 100 weights of the resin. 30 to 100 parts by weight with respect to parts, the particle size of the glass beads is 30 to 120 μm, and the adhesion amount of the resin is 100 to 300 g / m ² . The windproof snow sheet according to claim 1, wherein the difference between the gain values of 5 ° and 50 ° , measured by the following method , is 0.1 to 5.0.
The sheet was attached to the wall of the dark room, a white screen of a projector (MP-700 manufactured by Nippon Avionics) was irradiated from a position 2 m from the wall, and the brightness of the sheet surface was measured with a luminance meter (LS-100 manufactured by Konica Minolta). . The obtained luminance was substituted into the following equation and converted into a gain value. The gain value was measured at a position where the projector position was 0 °, and was shifted to the right by 5 ° and 50 °. The difference between the gain values of 5 ° and 50 ° was obtained.
Gain value = luminance / illuminance × 3.14